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How did high school mathematics change from one category to two categories and three categories? Seek specific steps! Urgent! ! !
Cosa = sin (1/2pai-a) is substituted into one formula to get the second formula.

tana = Sina/cosa tan( 1/2pai-a)= sin( 1/2pai-a)/cos( 1/2pai-a)= cosa/Sina

So the reciprocal multiplication of the two is one.

Namely, three types

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